add custom error handler for lnurl

__init__.py

@@ -1,8 +1,12 @@
-from fastapi import APIRouter
+from fastapi import APIRouter, Request, Response
+from fastapi.routing import APIRoute
+
 from fastapi.staticfiles import StaticFiles
+from fastapi.responses import JSONResponse
 
 from lnbits.db import Database
 from lnbits.helpers import template_renderer
+from typing import Callable
 
 db = Database("ext_withdraw")
 
@@ -15,7 +19,29 @@ withdraw_static_files = [
 ]
 
 
+class LNURLErrorResponseHandler(APIRoute):
+    def get_route_handler(self) -> Callable:
+        original_route_handler = super().get_route_handler()
+
+        async def custom_route_handler(request: Request) -> Response:
+            try:
+                response = await original_route_handler(request)
+            except HTTPException as exc:
+                logger.debug(f"HTTPException: {exc}")
+                response = JSONResponse(
+                    status_code=exc.status_code,
+                    content={"status": "ERROR", "reason": f"{exc.detail}"},
+                )
+            except Exception as exc:
+                raise exc
+
+            return response
+
+        return custom_route_handler
+
+
 withdraw_ext: APIRouter = APIRouter(prefix="/withdraw", tags=["withdraw"])
+withdraw_ext.route_class = LNURLErrorResponseHandler
 
 
 def withdraw_renderer():